1
GATE ME 2004
+5
-1.5
A standard machine tool and an automatic machine tool are being compared for the production of a component. Following data refers to the two machines.

The breakeven production batch size above which the automatic machine tool will be economical to use, will be

A
$$4$$
B
$$5$$
C
$$24$$
D
$$225$$
2
GATE ME 2004
+5
-1.5
In an orthogonal cutting test on mild steel, the following data were obtained
Cutting speed: $$40$$ $$m/min,$$
Depth of cut: $$0.3$$ $$mm,$$
Tool rake angle : $$+ {5^ \circ },$$
Chip thickness: $$1.5$$ $$mm,$$
Cutting force: $$900$$ $$N,$$
Thrust force: $$450$$ $$N$$
Using Merchant's analysis, the Friction angle during the machining will be
A
$${26.5^ \circ }$$
B
$${31.5^ \circ }$$
C
$${45^ \circ }$$
D
$${63.40^ \circ }$$
3
GATE ME 2003
+5
-1.5
A cylinder is turned on a lathe with orthogonal machining principle. Spindle rotates at $$200rpm$$. The axial feed rate is $$0.25$$ $$mm$$ per revolution. Depth of cut is $$0.4mm.$$ The rake angle is $${10^ \circ }.$$ In the analysis it is found that the shear angle is $${27.75^ \circ },$$

The thickness of the produced chip is

A
$$0.511$$ $$mm$$
B
$$0.528$$ $$mm$$
C
$$0.818$$ $$mm$$
D
$$0.846$$ $$mm$$
4
GATE ME 2003
+5
-1.5
A cylinder is turned on a lathe with orthogonal machining principle. Spindle rotates at $$200rpm$$. The axial feed rate is $$0.25$$ $$mm$$ per revolution. Depth of cut is $$0.4mm.$$ The rake angle is $${10^ \circ }.$$ In the analysis it is found that the shear angle is $${27.75^ \circ },$$

In the above problem, the coefficient of friction at the chip tool interface obtained using Earnest and Merchant theory is

A
$$0.18$$
B
$$0.36$$
C
$$0.71$$
D
$$0.98$$
GATE ME Subjects
EXAM MAP
Medical
NEET